// Bump Mapping FX
// [ArbVpTechnique, pass 2]
//
// Profile: ARBVP1
// Options: position invariant
// Copyright 2003 by Marco Jez

struct Vertex_data {
	float4 Position  : POSITION;    // vertex position
	float4 Normal    : NORMAL;      // vertex normal
};


struct Fragment_data {
	float4 Position       : POSITION;
	float4 SelfShadowing  : COLOR0;
};


Fragment_data main(Vertex_data input)
{
	Fragment_data output;
	
	// compute eye-space normal vector
	float4 viewNormal = mul(glstate.matrix.invtrans.modelview[0], input.Normal);
	
    	// compute diffuse shadowing term
    	float Lz = dot(viewNormal.xyz, glstate.light[0].position.xyz);
    	output.SelfShadowing.xyz = min(8 * max(Lz, 0), 1);
    	output.SelfShadowing.w = 1;

    	// transform position to projection space
    	output.Position = mul(glstate.matrix.mvp, input.Position);
    
    	return output;
}